Saw-sharpener.



Patented Oct. 23. 900.

wilgcsscs ma Naam ruins co, Puma-uma, WASHINGTON. n. c.

JAMES WM. GREEN, OF PORTLAND, OREGON..

SA-l-SHARPENER..

SPECIFICATION forming part of Letters Patent N o. 660,105, dated October 23, 1900. Application filed December 23, 1899. nerial 110.741.429. (N mOdBL) To al?, whom, it may concern:

Be it known that I, JAMES WM. GREEN, a citizen of the United States, residingat Portland, in the county of Multnomah and State of Oregon, have invented a new and useful Saw-Sharpener, of which the following is a specification. r

This invention relates to saw-sharpening devices, and more particularly to that class embodying rotary grinders or cutters which are adapted to successively engage the teeth of a saw to sharpen the teeth and move the implement longitudinally of the saw.

One object of the invention is to provide a construction comprising a frame which may be held in the hand and provided with cutters or grinders and an operating-crank which may be operated to effectively and quickly sharpen the teeth of the saw and in which the operation of the cutters or grinders will effect the movement of the frame with the grinders longitudinally of the saw to engage the teeth of the saw successively.

A further object of the invention is to provide a form of cutter or grinder which may be quickly and easily made and which will be effective in operation.

In the drawings forming a portion of this specication, and in which similar numerals of reference designate like and corresponding parts in the several views, Figure 1 is a view partly in section and partly in elevation and showing the sharpening device in operative position to a saw to be operated upon. Fig. 2 is an end view of the sharpening device, partly in section, to show the method of attachment to the guide-plates thereto. Fig. 8 is a bottom plan view of the Sharpener. Fig. eis a section taken through the supporting-frame above the cutters.

Referring now to the drawings, the invention comprises a 'Ll-shaped frame including parallel arms 5 and 6, upon the web of which frame is disposed a handle 7a. In the ends of the arms 5 and 6 are formed alining perforations 7 and 8, respectively, which perforations are threaded, and with the threads are engaged threaded sleeves 9 and 10, having enlarged heads 11 and 12 to facilitate the adjustment of the sleeves. The sleeve is interiorly threaded, as shown in Fig. 1 of the drawings, and with these threads are engaged the threads upon one end of a shaft 14, which is passed through the sleeve 9.

The extremities of the opposite end of the shaft 14 are threaded, and upon the threads at the extreme ends of the shaft are disposed clamping-nuts 15 and 16, which are adapted to impinge the outer ends of the sleeves 9 and 10 to hold the shaft and the sleeves from displacement.

Upon the shaft 14 are loosely disposed two beveled gears 17 and 18, with their teeth disposed toward each other, and which gears have cross-sectional angular hubs 19 and 20, respectively. Upon the shaft 14 and between the gears 17 and 18 and the sleeves 9 and 10, respectively, are rotatable cutters 21 and 22, which are adapted to turn merely upon the shaft and which have angular recesses at their mutually-adjacent ends which receive the hubs 19 and 20 in order that these cutters may he rotated with the bevel-gears.

A bracket 25 is connected at its ends With the arms 5 and 6 of the supporting-frame and lies parallel with the shaft 14,this bracket having a bearing 2G, in which is disposed a crank-shaft 27, provided with a crank 28, the

base of the crank 28 being enlarged to lie against the outer end of the bearing 2G and prevent longitudinal movement of the shaft 27 in the direction of the shaft 111. Upon the inner end of the shaft 27 is fixed a bevel-gear 29, in engagement with the gears 17 and 18, and the hub 30 of which lies against the inner face of the bracket 25, and thus holds the bevel-gear 29 from disengagement with the gears 17 and 18.

The cutters 21 and 22 are cylindrical in outline, and each of these cutters has concentric helical grooves in its periphery, resulting in similar flanges, the cross-section of each of which is similar to the interspaces between the teeth of the saw to be sharpened, while the pitch of the flanges is equal to the bevel of the saw-teeth.

The lower ends of the arms 5 and 6 are enlarged transversely at the points through which the perforations '7 and 8 are formed, and the extremities are bifurcated, as shown at 30 and 31, and are separated by an interspace slightly greater than the thickness of the material of which the saw is formed.

Connecting the bifurcations 30 at opposite TOO ends of the ange is a bearing-plate32, while a similar bearing-plate 33 connects the ends of the bifurcations 3l,the result being a guideway 34, which receives the blade of the saw.

In practice, as shown in Fig. l of the drawings, the Sharpener is disposed to receive the blade 37 of a saw between the guide-plates 32 and and with the ribs or ianges of the cutters lying in the interspaces between the teeth, the separation of the ribs or anges being such that they Will inclose two teeth, as shown in Fig. l. The crank 28 is then operated and the cutters are rotated in opposite directions. The helical anges, however,

are oppositely disposed, and thus engagement of the flanges with the teeth of the saw causes the Sharpener to progress longitudinally of the saw blade, and thus engage the teeth successively. The two cutters are so disposed with respect to each other that the after cutter engages the surfaces of the teeth that are I skipped by the forward cutter, and in this Way the whole number of teeth are effectively treated.

In the formation of the cutters the operating-faces thereof are corrugated, these corrugations being disposed at angles to the adjacent radii of the rollers and lying in such a position that the foremost ends of the cor- 'l rugations are disposed outwardly, as illus- 1 trated in Fig. 4, so that the corrugations will act to draw the edges of the cutters downwardly between the teeth instead of forcing them outwardly, as is customary.

It will of course be understood that the cutters may be of any desired length and that they may be changed to conform todifferent saws, and it will be seen that with the structure above described the Glitters may be removed for substitution of other cutters and the parts may be assembled and disassembled quickly and easily.

What is claimed is- 1. A saw-Sharpener comprisinga frame, the ends of which are bifurcated, guide-plates connecting corresponding bifurcations and separated by an interspace, sleeves removably engaged with the frame, a shaft passed through the sleeves, bevel -gears mounted loosely upon the shaft and having cross-sectional angular' hubs, cutters disposed upon the shaft and having recesses in which the hubs of the bevel-gears are fitted, a bracket, a shaft journaled in the bracket and having a bevel-gear meshing with the first-named gears, and means for rotating the shaft.

2. A saw-sharpening device, comprising a frame which is U-shaped and the ends of which are bifurcated, plates secured to the corresponding bifurcations and separated by an iuterspace forming a guideway, abrading elements mount-ed in the frame above the guideway for engagement with a saw-blade in its passage into the guideway, and means for rotating the abrading elements.

1n testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

JAMES WM. GREEN.

Witnesses:

J. B. EASTER, H. W. HERRON. 

